<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    div{
        width: 300px;
        height: 300px;
        margin: 200px auto;
        background: repeating-radial-gradient(circle at left bottom, 
        #ccc 0%, #ccc 10%, transparent 10%, transparent 20%); 
        border-radius: 0 75% 0 0; 
    }
    </style>
</head>
<body>
    <div></div>
</body>
</html>